| About this Abstract |
| Meeting |
6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
| Symposium
|
6th World Congress on Integrated Computational Materials Engineering (ICME 2022)
|
| Presentation Title |
Core Structure, Energy, and Mobility of Pyramidal Dislocations in Magnesium |
| Author(s) |
Yang Yang, Bin Li, Kefan Chen |
| On-Site Speaker (Planned) |
Yang Yang |
| Abstract Scope |
Magnesium (Mg) and its alloys are attractive lightweight structural materials for improving energy efficiency in automotive and aerospace applications. However, the room temperature ductility of Mg is limited because of the lack of sufficient pyramidal dislocations that are able to accommodate the strain along the c-axis but have a critical resolved shear stress nearly two orders of magnitude higher than basal dislocations. Previous simulations showed that pyramidal dislocations tend to dissociate onto the basal plane, forming an immobile configuration. In this work, we show new simulation results and demonstrate that both Py-I on {10-11} and Py-II {11-22} dislocations are stable and mobile. The Nye tensor which describes the degree of lattice distortion of dislocation core for these dislocations is calculated. Atomic stress and dislocation energy are also calculated. |
| Proceedings Inclusion? |
Definite: Other |